Fluke 1502A 7.2 GPIB Interface

to the time stamp parameter.The display will briefly show “ti Sta” then the

time stamp state which is either ON or OFF.Use the Uand Dbuttons to

change the state and press Enter.ON enables transmission of the time stamp

and OFF disables it.

The timestamp can also be set using the “ST” communications command. The

command ST=ON<EOS> enables the time stamp and ST=OF<EOS> disables

it.

The clock and time stampparameters affect the time stamp of data read through

both the RS-232 and IEEE-488 interfaces.

Commands sent to the1502A through the RS-232 interfaceare normally ech-

oed back to the remotedevice. To disable this feature set the duplex option to

half insteadof full. The duplex parameter is found in the Comm menu after the

sample period parameter.The display will briefly indicate “dUPL”andthen

display the current duplexsetting. Use the Uand Dbuttons to set duplex to

“HaLF”or“FULL”thenpressEnter.

Duplexcan also be set using the “DU” communications command. The com-

mand DU=H<EOS> setsduplex to half and DU=F<EOS> sets duplex to full.

Transmissionsfrom the 1502A through the RS-232 interface are normally fol-

lowedby a linefeed character (ASCII decimal 10). The linefeed character can

be disabled by setting the linefeed “LF” parameter to “OFF”. The linefeed pa-

rameter isfound in the Comm menu after the duplex parameter. The display

will briefly indicate “LF” and then display the current linefeedsetting. Use the

Uand Dbuttons to set linefeed “On”or“OFF”thenpressEnter.

The linefeed can also be setusing the “LF” communications command. The

command LF=OF<EOS> disables the linefeed character and LF=ON<EOS>

enables it.

7.2 GPIB Interface

The 1502A is availablewith an optional IEEE-488 (GPIB) port. The IEEE-488

interfaceis useful when one computer needs to control and collect data from

manyinstruments simultaneously. The IEEE-488 connector is located on the

back panel of the 1502A abovethe RS-232 connector. To eliminate noise, the

GPIB cableshould be shielded.

The 1502A is equipped with basic communication capabilitiesas specified in

IEEE-488.1. The particular capabilities of the IEEE-488 interface are AH1,

SH1, T6, L4, DC1 (TE0, LE0, SR0, RL0, PP0, DT0). Refer to “IEEE Std

488.1-1987". The 1502A can talk and listen and acceptsthe DCL and SDC

clear commands. The 1502A does not respond to trigger (GET), serial poll,

parallelpoll, or remote/local commands and is not capable of talk-only mode.

7 Digital Communications Interface

GPIB Interface